The state is vicariously liable for unlawful assaults committed by police officers acting within the course and scope of their employment. Where there are two mutually destructive versions in a civil case, the plaintiff succeeds if the court is satisfied on a preponderance of probabilities that the plaintiff's version is true and acceptable and the defendant's version is false or mistaken. In assessing a single witness's evidence, the court must weigh the evidence, consider its merits and demerits, and decide whether it is trustworthy despite any shortcomings. Police officers have a constitutional duty under section 7(2) to respect, protect, promote and fulfill the rights in the Bill of Rights, including the right to be free from violence and cruel, inhuman or degrading treatment under section 12 of the Constitution.